Adjustable eccentric



UNITED STATES PATENT OFFICE.

JAMES H. BARNES, OF NEWTON, IOWA.

ADJUSTABLE ECCENTRIC.

SPECIFICATION forming part of Letters Patent No. 242,100, dated May 31, 1881.

Application filed June 12, 1880. (No model.)

To all whom it may concern Be it known that I, JAMES H. BARNES, of Newton, in the county of Jasper and State of Iowa, have invented a new and valuable Improvement in an Adjustable Eccentric; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being'had to the annexed drawings, making a part of this specification, and to the letters and figures of reference marked thereon.

Figure 1 of the drawings is a representation of a longitudinal central section of my improved eccentric, and Figs. 2 and 3 are details.

This invention has relation to improvements in eccentrics.

The object of the invention is, in machines where rotary is converted into reciprocating motion, to regulate the throw of the eccentric, so as to lengthen or shorten the stroke.

My improved eccentric is, however, more especially adapted to regulating the movements of the shaker in fanning-mills and other cognate machines.

In the accompanying-drawings, the letter A designates the eccentric-disk, having the usual grooved periphery and a slot, (1, extending from one side of the geometric center of the disk considerably to the other side thereof. It has also in one face two rectangular grooves, a, arranged parallel to the slot, and one on each side thereof.

B indicates the shaft, having a collar or shoulder, b, and a squared body, 0, fitting snugly into and extending through the slot (1. This shaft or spindle terminates in a screwthreaded portion, (1, over which is passed a washer, 0, having projecting spurs e, that are received in the grooves a. of the eccentric-disk A, and hold the said washer against rotation.

A jam-nut, N, is then passed onto the part (2 of the shaft and forcibly set up against the washer, thus jamming the eccentric-disk against the collar b and fixing it in position. Byloosening the nut the eccentricdisk may be adjusted with its geometric center nearer to or farther from the axis of shaft B, thus shortening or lengthening the throw of the said disk.

I am aware that an eccentric-disk adjustable to vary its throw is not new, and I do not broadly claim such a device.

I am aware that a fixed disk upon the shaft B has been provided with tangential grooves which start from a common point or focus, but terminate at points varying in distance from the axis of the disk, so that the throw of the eccentric will be changed by passing a fixed wrist-pin on the face thereof from the end of one groove to that of another, as is shown in Patent No. 142,898, of September 16, 1873, which construction I specifically disclaim.

What I claim as new, and desire to secure by Letters Patent, is-

In an adjustable eccentric, the combination, with the shaft B, having the bearing-collar b, the square portion 0, and screw-thread cl, of the eccentric-disk A, having the rectangular slot at, and the grooves a a on opposite sides of the slot at and parallel therewith,the washer 0, passed over the shaft and provided with spurs e, entering the grooves a a, and the jamnut N, constructed and operating substantially as and for the purposes set forth.

In testimony that I claim the above I have hereunto subscribed my name in the presence of two witnesses.

JAMES H. BARNES.

Witnesses:

JOSEPH M. WEST, WM. H. PARDOE. 

